Organocatalytic Ring-Opening Polymerization of Morpholinones: New Strategies to Functionalized Polyesters
作者:Timothy R. Blake、Robert M. Waymouth
DOI:10.1021/ja503830c
日期:2014.7.2
[LPd(OAc)]2(2+)[OTf(-)]2 generates N-substituted morpholin-2-ones. The organocatalytic ring-openingpolymerization of N-acyl morpholin-2-ones occurs readily to generate functionalized poly(aminoesters) with N-acylated amines in the polyester backbone. The thermodynamics of the ring-openingpolymerization depends sensitively on the hybridization of the nitrogen of the heterocyclic lactone. N-Acyl morpholin-2-ones
Metal‐Free Synthesis of
<i>N</i>
‐Aryl Amides using Organocatalytic Ring‐Opening Aminolysis of Lactones
作者:Wusheng Guo、José Enrique Gómez、Luis Martínez‐Rodríguez、Nuno A. G. Bandeira、Carles Bo、Arjan W. Kleij
DOI:10.1002/cssc.201700415
日期:2017.5.9
Catalytic ring‐opening of bio‐sourced non‐strained lactones with aromatic amines can offer a straightforward, 100 % atom‐economical, and sustainable pathway towards relevant N‐aryl amide scaffolds. Herein, the first general, metal‐free, and highly efficient N‐aryl amide formation is reported from poorly reactive aromatic amines and non‐strained lactones under mild operating conditions using an organic
Pd-Catalyzed Aerobic Oxidation Reactions: Strategies To Increase Catalyst Lifetimes
作者:Wilson C. Ho、Kevin Chung、Andrew J. Ingram、Robert M. Waymouth
DOI:10.1021/jacs.7b11372
日期:2018.1.17
10-phenanthroline) is an effective catalystprecursor for the selectiveoxidation of primary and secondary alcohols, vicinal diols, polyols, and carbohydrates. Both air and benzoquinone can be used as terminal oxidants, but aerobic oxidations are accompanied by oxidative degradation of the neocuproine ligand, thus necessitating high Pd loadings. Several strategies to improve aerobic catalyst lifetimes were devised
钯络合物 [(neocuproine)Pd(μ-OAc)]2[OTf]2 (1, neocuproine = 2,9-dimethyl-1,10-phenanthroline) 是伯醇和仲醇选择性氧化的有效催化剂前体、邻二醇、多元醇和碳水化合物。空气和苯醌都可以用作末端氧化剂,但有氧氧化伴随着新铜碱配体的氧化降解,因此需要高 Pd 负载。在催化剂失活的机理研究的指导下,设计了几种提高有氧催化剂寿命的策略。这些研究暗示了从新铜碱配体中提取 H 原子引发的自由基自氧化机制。旨在延缓 H 原子提取以及添加牺牲性 H 原子供体的配体修饰增加了催化剂寿命并导致在有氧条件下更高的周转数 (TON)。其他研究表明,添加苄型氢过氧化物或苯乙烯也会导致 TON 显着增加。机理研究表明,苄型氢过氧化物充当 H 原子供体,而苯乙烯可有效拦截 Pd 氢化物。这些策略能够使用低至 0.25 mol% 的 Pd 以制
Flavin Nitroalkane Oxidase Mimics Compatibility with NOx/TEMPO Catalysis: Aerobic Oxidization of Alcohols, Diols, and Ethers
作者:Pawan Thapa、Shan Hazoor、Bikash Chouhan、Thanh Thuy Vuong、Frank W. Foss
DOI:10.1021/acs.joc.0c01013
日期:2020.7.17
and inexpensive source for catalytic NO2 for aerobic TEMPO oxidations of alcohols, diols, and ethers. Alcohols were oxidized to aldehydes or ketones, cyclic ethers to esters, and terminal diols to lactones. In situ trapping of NOx and formaldehyde suggest an oxidative Nef process reminiscent of flavoprotein nitroalkane oxidasereactivity, which is achieved by relatively stable 1,10-bridged flavins
仿生黄素有机催化剂将硝基甲烷氧化为甲醛和NO x,为乙醇,二醇和醚的需氧TEMPO氧化提供了一种相对无毒,无苛刻且廉价的催化NO 2来源。醇被氧化成醛或酮,环醚被氧化成酯,末端二醇被氧化成内酯。NO x和甲醛的原位捕集表明氧化Nef过程使人联想到黄素蛋白硝基烷氧化酶的反应性,这是通过相对稳定的1,10-桥联黄素实现的。无金属的黄素/ NO x / TEMPO催化循环具有独特的相容性,尤其是与其他Nef和NO x相比生成过程,并显示出黄素催化亚砜形成的选择性。脂肪族醚通过这种方法被氧化,如(-)-氨氧化物转化为(+)-香紫苏内酯所证明的。
[EN] IMMOLATIVE CELL-PENETRATING COMPLEXES FOR NUCLEIC ACID DELIVERY<br/>[FR] COMPLEXES DE PÉNÉTRATION CELLULAIRE IMMOLATEURS POUR L'ADMINISTRATION D'ACIDES NUCLÉIQUES
申请人:UNIV LELAND STANFORD JUNIOR
公开号:WO2018022930A1
公开(公告)日:2018-02-01
There are provided herein, inter alia, complexes, compositions and methods for the delivery of therapeutic, diagnostic and imaging agents, including nucleic acid, into a cell. The complexes, compositions and methods may facilitate complexation, protection, delivery and release of oligonucleotides and polyanionic cargos into target cells, tissues, and organs both in vitro and in vivo.